Page author: David Giblin
Sidalcea oregana
Oregon checker-mallow
WTU specimens
Other herbaria

Distribution: Chiefly east of the Cascades in Washington; Washington south to California, east to Wyoming.

Habitat: Sagebrush plains, meadows and ponderosa pine forests.

Flowers: May-July

Origin: Native

Conservation Status: Not of concern

Description:
General:

Herbaceous perennial from a stout taproot and branched crown, but without rhizomes; stems 2-15 dm. tall, glabrous to stiff-hairy or stellate below, finely stellate above.

Leaves:

Leaves alternate, highly variable, palmately shallowly to very deeply lobed, the lobes with a few coarse, rounded teeth.

Flowers:

Inflorescence of many-flowered, simple to compound racemes, spike-like to open and lax, the pedicels 1-10 mm. long; calyx 5-lobed, 3.5-9 mm. long, variously pubescent; petals light pinkish to deep pink, 1-2 cm. long, clawed, obovate and notched; stamens 40-70, freed from the staminal tube in 2-3 series, the stamens united in groups; ovary superior, the carpels 5-10 in a ring around a central axis; styles equal to the number of carpels, elongate, stigmatic full length.

Fruits:

Capsule 2.5-3 mm. long, with a beak 0.3-0.7 mm. long.

Accepted Name:
Sidalcea oregana (Nutt. ex Torr. & A. Gray) A. Gray

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. calva – Oregon checker-mallow
var. oregana – Oregon checker-mallow
Additional Resources:

PNW Herbaria: Specimen records of Sidalcea oregana in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Sidalcea oregana checklist entry.

E-Flora BC: Sidalcea oregana atlas page.

CalPhotos: Sidalcea oregana photos.

USDA Plants: Sidalcea oregana information.

61 photographs:
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